the flame developing crank angle showed little variation with engine load and speed, while the rapid burning crank angle and total combustion crank angle decreased with the increase of bmep.
火焰发展期随负荷和转速的变化不大,快速燃烧期和总燃烧期随负荷的增加而缩短。
with the increase of mixing ratio, the maximum value of heat releasing rate increases, and the crank angle delays.
随掺混比的提高,放热率峰值略有增加,所对应的曲轴转角后移;
according to the basic characteristics of internal combustion engines, crank angle domain and its frequency domain were chosen, and engine momentary speed fluctuations were divided.
the results showed that:the combustion processes in the engine could be observed, and the flame images and pressure changes with the crank angle could be recorded;
it is shown that the error of transient engine speed measurement comes from both the time interval counter and crank angle measure.
瞬时转速测量的主要误差为晶振脉沖计数误差和转角计量误差。
the transient change of discharge coefficient via engine crank angle is calculated for the first time.
首次计算出连接通道流量系数随曲轴转角的瞬时变化规律。
the peak value of initial heat release is decreased and its corresponding crank angle moves close to the top-dead-center along with the increased combustion duration.